The factory workers only appear in the Halo 3 campaign level The Storm. Despite the fact that they are civilians, factory workers are able to wield all weapons, both human and Covenant, with the exception of Energy Swords and Brute Shots, unless through a glitch. This is more of a gameplay element where Bungie recycled all human biped and replacing these bipeds' textures with civilian variants. The workers still have the same amount of health as a Marine.